CN102915874A - Thermal-response switch - Google Patents
Thermal-response switch Download PDFInfo
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- CN102915874A CN102915874A CN2011102196056A CN201110219605A CN102915874A CN 102915874 A CN102915874 A CN 102915874A CN 2011102196056 A CN2011102196056 A CN 2011102196056A CN 201110219605 A CN201110219605 A CN 201110219605A CN 102915874 A CN102915874 A CN 102915874A
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- thermal response
- fixed
- outer casing
- response switch
- plate
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Abstract
The invention discloses a thermal-response switch for a refrigerant compressor. The thermal-response switch can quickly and accurately detect temperature change and the like of a refrigerant by improving internal and external thermal conductivity of an airtight container, and is provided with an outer casing made of metal and a pressure-resistant airtight container consisting of a cover plate. The cover plate consists of a metal plate and a conductive terminal pin airtightly penetratingly fixed on the metal plate. An opening of the outer casing is welded to the surface of the cover plate circumferentially in a projection manner so that the pressure-resistant airtight container is formed. Further, a radiating portion capable of increasing the surface area of the pressure-resistant airtight container is formed by processing the surface of the pressure-resistant aright container. Since a recess serving as the radiating portion is formed on the surface of the outer casing in a stamping manner, the total surface area of the outer casing is increased on the premise of not changing basic structure of the thermal-response switch.
Description
Technical field
The present invention relates to the thermal response switch that a kind of thermal response switch, particularly structure that uses bimetal leaf etc. is applicable to the employed sealed electrical compressors such as air-conditioning.
Background technology
All the time, the employed cold-producing medium such as air-conditioning has used to prevent that motor is because of the protective device of overheated or overcurrent scaling loss etc. with in the motor compressor.
Particularly in reactive situation of paying attention to abnormal conditions, protective device is installed in the closed container of sealed electrical compressor, and what therefore use is the thermal response switch with the withstand voltage gas-tight container of metal-made.
Patent documentation in the past, for example Japan speciallys permit communique No. 2519530, and Unexamined Patent 10-144189 communique discloses this thermal response switch, and this thermal response switch has example structure as shown in Figures 7 and 8.Thermal response switch 101 consists of withstand voltage gas-tight container by metal-made outer casing 102 and cover plate 103.
Be installed on the gas-tight container medial end of one of them the conducting terminal pin 6A on the described cover plate 103, be welded and fixed and described travelling contact 7 contact 9 that is relatively fixed.On the gas-tight container medial end of another conducting terminal pin 6B, be welded and fixed an end of heater 10, the other end of heater 10 is weldingly fixed on the metallic plate 104.On the surface of the electric insulation filler 5 of gas-tight container inboard, have no to be close to gap the cover 11 of pottery system, to increase creepage distance, prevent that simultaneously the flying etc. when electric arc produces is attached on the filler.In addition, the electric insulation filling surface in the gas-tight container outside is being coated with the electrical insulating materials 12 such as epoxy resin, to obtain sufficient creepage distance.Therefore, even with the thermal response switch miniaturization, also can obtain sufficient electric insulation distance.The operating temperature of this thermal response switch 101 is to proofread and correct by being out of shape near the thermal response plate fixed part that makes gas-tight container from the outside.
This thermal response switch 101 is installed in the closed container of coolant compressor, with motor in series.Like this, the operating current of motor just flows through in the circuit of conducting terminal pin 6B-heater 10-metallic plate 104-outer casing 102-thermal response plate 8-travelling contact 7-fixed contact 9-conducting terminal pin 6A composition.During motor compressor work, the heater of thermal response switch and thermal response plate etc. are because operating current generates heat, still, under normal conditions, these heats are absorbed by the cold-producing medium around flowing through, therefore, the thermal response plate remains on below the operating temperature of setting, and "on" position is maintained.
If because of some reason, the temperature of cold-producing medium is in superheat state, perhaps the heating of thermal response switch inside is because of to some extent increases such as overcurrent, the thermal response plate is heated to more than the temperature of setting, its bending direction of thermal response board reversal then, make travelling contact break away from fixed contact, cut off the energising to motor, take precautions against the possible trouble that betides of the state of affairs such as scaling loss.In addition, contact welding etc. finally occurs through repetitive operation in the thermal response plate, causes carrying out the on-off action between contact, excessive electric current continue by the time, circuit is cut off in the then part of heater 10 fusing.
As previously mentioned, thermal response switch in the past can detect overheated or overcurrent and action, still, in recent years, for the variations in temperature that further detects cold-producing medium etc., needs further to improve the heat exchange performance of thermal response switch.Be installed in the thermal response switch of the closed container inside of sealed electrical compressor, the closed container that is made of metal as previously mentioned, therefore and the heat exchanger effectiveness of cold-producing medium higher, but, for the more definite variation that promptly detects cold-producing medium, need further to improve heat exchanger effectiveness, improve thermal response switch to the reactivity worth of environment temperature variation or heat dissipation capacity variation.
Summary of the invention
The objective of the invention is in the situation of the essential structure that does not change thermal response switch, a kind of compressive resistance that can keep gas-tight container is provided, can improve again the inside and outside heat conductivity of gas-tight container, the thermal response switch of the more definite variations in temperature that promptly detects cold-producing medium etc.
Thermal response switch of the present invention arranges the radiating part of the gas-tight container surface area that increases thermal response switch by the jog made by punch process or cut etc. etc. is set on the surface of gas-tight container.
Exposure by such increase gas-tight container and cold-producing medium, improve heat exchanger effectiveness, then much less can improve the reactivity worth that refrigerant temperature is changed, when the flow of cold-producing medium changes, because change with the heat exchange amount of cold-producing medium, the temperature of thermal response switch outer casing inside also can change rapidly.Therefore, under normal circumstances, promptly pass to cold-producing medium by the heating with inside, the thermal response plate is remained on below the operating temperature, on the other hand, refrigerant temperature rise or the situation of the mobile abnormal of refrigerant gas under, can make rapidly the thermal response plate reach operating temperature, cut off energising.
By adopting such hermetic type compressor thermal response switch, can improve the reaction speed to overheated or overcurrent, obtain higher protective value.
Description of drawings
Fig. 1 is the profile of the thermal response switch of the 1st embodiment.
Fig. 2 is the vertical view of the thermal response switch of Fig. 1.
Fig. 3 is the cover plate upward view partly of the thermal response switch of Fig. 1.
Fig. 4 is the profile of the thermal response switch of the 2nd embodiment.
Fig. 5 is the side cut away view of the thermal response switch of Fig. 4.
Fig. 6 is the cover plate upward view partly of the thermal response switch of Fig. 5.
Fig. 7 is the profile of the thermal response switch of an embodiment in the background technology.
Fig. 8 is the A-A profile of the thermal response switch of Fig. 7.
Each label represents in the accompanying drawing:
1,21 thermal response switchs
2 outer casings
2A recess (radiating part)
The 2B flank
3,23 cover plates
4,24 metallic plates
5 electric insulation fillers
6A, 6B conducting terminal pin
Embodiment
Below in conjunction with accompanying drawing, describe the specific embodiment of the present invention in detail.The part identical with in the past thermal response switch used same mark, detailed.
Fig. 1 extremely thermal response switch 1 shown in Figure 3 has the withstand voltage gas-tight container that is made of metal outer casing 2 and cover plate 3.Cover plate 3 is made of metallic plate 4 and conducting terminal pin 6A and 6B.Metallic plate 4 is provided with through hole 4A, and conducting terminal pin 6A and 6B pass through hole 4A, and insulate airtightly by electric insulation fillers 5 such as glass and to be fixed on the metallic plate 4.With the peristome of outer casing 2 by all-round surfaces that is welded on cover plate 3 such as projection weldings, thereby consist of described withstand voltage gas-tight container.
In the present embodiment, be provided as the recess 2A of radiating part on the surface of outer casing 2 by punch process, to increase total surface area, therefore, in the situation that does not change the thermal response switch essential structure, increased the total surface area of outer casing.This thermal response switch is installed in the closed container of sealed electrical compressor, when making it be exposed in the cold-producing medium, cold-producing medium is along flowing through as the recess of radiating part etc., and Exposure was than increasing in the past, thereby improved the heat exchanger effectiveness of thermal response switch 1 with cold-producing medium.
In addition, at outer casing 2 recess 2A is set, recess 2A and flank 2B have been consisted of jointly increases the structure of outer casing 2 intensity, thereby can improve the compression resistance intensity of outer casing.Therefore, can make the thickness ratio thermal response switch in the past of outer casing thin, mutually combine with increasing these means of surface area, further improve heat conduction efficiency.
During normal operation, although because flowing through the operating current in the thermal response switch, the heatings such as thermal response plate 8 and heater 10, but this heat increases recess 2A that surface area arranges in interior outer casing 2 integral body by being included as, distribute to cold-producing medium rapidly, therefore, thermal response plate 8 remains on below the operating temperature.Therefore, during normal operation, thermal response switch is failure to actuate, and the work of motor compressor does not stop.
If when rising because of the temperature of some reason cold-producing medium, the heat from thermal response switch 1 to cold-producing medium moves and tails off, then the temperature of thermal response switch inside rises.In addition, during mobile the changing of refrigerant gas, the amount of the cold-producing medium of contact thermal response switch also changes, thereby the heat dissipation capacity from thermal response switch to cold-producing medium also changes thereupon.In addition, when occuring because of situations such as overload etc. cause that the rotation of motor is restrained, have larger overload electric current to flow through, this moment thermal response switch inside caloric value considerably beyond the heat dissipation capacity by cold-producing medium.In above-mentioned these situations, thermal response plate 8 reaches operating temperature, and its bending direction that reverses cuts off circuit, can prevent the generations such as motor scaling loss.
In addition, the metallic plate 4 of cover plate 3 is such as Fig. 1 and shown in Figure 3, enlarged the width of the circumference 4B thinner than central portion, make the Thickness Ratio of metallic plate 4 integral body metallic plate in the past 104 shown in Figure 7 thin, so easier outside that is delivered to of heat of gas-tight container inside, on the basis of aforementioned increase outer casing one side heat dissipation capacity, further increased the heat dissipation capacity of cover plate one side.As for the 4C around the through hole 4A, owing to want electricity consumption insulating packing fixed conductive terminals pin, then through hole must have certain degree of depth and intensity, so its thickness is identical with in the past metallic plate.
As mentioned above, the thermal response switch of present embodiment, can move rapidly during therefore in refrigerant superheat or because of abnormal conditions such as overload work generation overcurrent owing to by the concavo-convex surface area that increases is set, improved heat exchanger effectiveness, cuts off energising.In addition, owing to because the concavo-convex flank 2B role that forms is set, although with the thickness of slab attenuation of outer casing, also can keep the compression resistance intensity of outer casing.So, when improving heat conduction efficiency by increase surface area and minimizing thickness of slab, also can keep the intensity of outer casing, make thermo-responsive and outer casing intensity be able to satisfactory to both parties.
In the present embodiment, be provided with clamp-on the outer casing inboard recess as radiating part, but radiating part also can be arranged to the protuberance shape in the outstanding outside.
Below in conjunction with Fig. 4 to Fig. 6, an alternative embodiment of the invention is described.In the present embodiment, thermal response switch 21 has used the cover plate 23 of being made by thinner metallic plate, replaces the cover plate 3 of the first embodiment.This cover plate 23 uses the metallic plate 24 of drawings, and the through hole 24A that needs certain depth roughly drawing is tubular.So, when improving heat conduction efficiency by the surface area that increases cover plate and the thickness that reduces cover plate, even metallic plate itself is very thin, also can seal reliably fixed conductive terminals pin 6A and 6B by electric insulation fillers 5 such as glass.Therefore and through hole 24A is outwards widen coniform, and the surface area as the glass of electric insulation filler becomes large, makes the creepage distance of conducting terminal pin and metallic plate elongated, thereby does not need to coat the electrical insulating materials such as epoxy resin that cover the electric insulation filler again.
The present invention can also adopt following execution mode:
Can carry out on the surface of outer casing such as exasperate processing etc. so that more groove or concavo-convex to be set, perhaps on the surface of outer casing high metallic pin or the metallic plate of pyroconductivity is installed, increase substantial surface area, even do not only limit to outer casing one side, can take to increase in cover plate one side the processing of surface area yet.
The above is preferred embodiment of the present invention only, is not to limit practical range of the present invention; If do not break away from the spirit and scope of the present invention, the present invention is made amendment or is equal to replacement, all should be encompassed in the middle of the protection range of claim of the present invention.
Claims (3)
1. thermal response switch, consist of withstand voltage gas-tight container by metal pressure vessel shell and the cover plate that is weldingly fixed on airtightly on the openend of outer casing, two conducting terminal pins thickly insulate by the electric insulation filler gas respectively and are fixed on two through holes that pass cover plate, be welded and fixed fixed contact on one of them conducting terminal pin, be welded and fixed an end of heater on another conducting terminal pin, the other end of heater is welded and fixed on the cover board;
Be connected and fixed to the inner conductive of described gas-tight container the thermal response plate, thermal response plate one end is being welded and fixed travelling contact, and drawing is plate-like near the central authorities, in the temperature jerk counter-rotating of regulation; Described travelling contact is arranged to consist of a pair of switching contact with described fixed contact;
Come Tc by near the distortion thermal response plate fixed part that makes gas-tight container;
The part of heater can fuse during the contact welding, cuts off circuit;
On the gas-tight container inner surface of the electric insulation filler that is fixed wtih the conducting terminal pin, have no to be close to gap and be fixed wtih thermal endurance inorganic insulation parts;
It is characterized in that:
By processing the surface of withstand voltage gas-tight container, the radiating part that increases its surface area is set.
2. thermal response switch according to claim 1 is characterized in that: arrange at outer casing by punch process concavo-convex, so that radiating part to be set.
3. thermal response switch according to claim 1 is characterized in that: by cut is carried out on the outer casing surface, so that radiating part to be set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110219605.6A CN102915874B (en) | 2011-08-02 | 2011-08-02 | Thermal-response switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110219605.6A CN102915874B (en) | 2011-08-02 | 2011-08-02 | Thermal-response switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102915874A true CN102915874A (en) | 2013-02-06 |
| CN102915874B CN102915874B (en) | 2015-04-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110219605.6A Active CN102915874B (en) | 2011-08-02 | 2011-08-02 | Thermal-response switch |
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| CN (1) | CN102915874B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016183889A1 (en) * | 2015-05-15 | 2016-11-24 | 深圳市鑫富达电器有限公司 | Thermally-insulated temperature-controlled heating plate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4306211A (en) * | 1979-04-30 | 1981-12-15 | Hofsass P | Heat operated protective switch |
| US5285183A (en) * | 1992-05-07 | 1994-02-08 | Nihon Seiken Kabushiki Kaisha | Temperature switch |
| JPH10144189A (en) * | 1996-11-08 | 1998-05-29 | Ubukata Seisakusho:Kk | Thermally-actuated switch |
| CN1311495C (en) * | 1999-04-06 | 2007-04-18 | 株式会社生方制作所 | Thermoswitch |
-
2011
- 2011-08-02 CN CN201110219605.6A patent/CN102915874B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4306211A (en) * | 1979-04-30 | 1981-12-15 | Hofsass P | Heat operated protective switch |
| US5285183A (en) * | 1992-05-07 | 1994-02-08 | Nihon Seiken Kabushiki Kaisha | Temperature switch |
| JPH10144189A (en) * | 1996-11-08 | 1998-05-29 | Ubukata Seisakusho:Kk | Thermally-actuated switch |
| CN1311495C (en) * | 1999-04-06 | 2007-04-18 | 株式会社生方制作所 | Thermoswitch |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016183889A1 (en) * | 2015-05-15 | 2016-11-24 | 深圳市鑫富达电器有限公司 | Thermally-insulated temperature-controlled heating plate |
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| Publication number | Publication date |
|---|---|
| CN102915874B (en) | 2015-04-01 |
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